QuestHelper is dead. It won't be supported in 4.0, or in any other patch for that matter. The author has thrown in the towel.

Hopefully someone else will pick it up again like last time though. Blizzard's quest tracking is a poor poor substitute.

The built-in QuestHelper now shows you the picture of the NPC you are going after, points you to the direction they are on on the minimap, and their names are always on, even if you have NPC names off.

If you need more help than that, the real QuestHelper won't help you either.

@Drakkenfyre: This is the kind of response you usually see from people who don't actually know what QuestHelper does. It's a bit like pointing out that the default auction house UI already tells you how much things cost, so what would you need an addon for?

Unless you can work out a 25 node "traveling salesman" problem in your head, using the Blizzard UI won't in any way help you do what QuestHelper does for you, no matter how much information it gives you about the precise location of questgivers and objectives. Finding them isn't the problem QuestHelper solves. Finding the optimal route to follow while doing many quests at the same time is what QuestHelper does, at well as remind you when you're in the vicinity of another quest's objectives while working on a different one. Using Blizzard's UI, unless you're one of people who only ever does one quest at a time, you're probably going to have the occasional "Damn, I should have also done *this* while I was over there earlier" moments. THAT is the problem QuestHelper solves.

Carbonite.
http://www.carboniteaddon.com/
Is what i use, I started on questhelper, but one of my guildmates turned me on to carbonite, its a whole lot better.

More interactive map, Inventory tracking across characters, Shows you the Range of the Quest mobs on your map (similar to what you see on wowhead's maps for mobs.) Its a great add-on.

Carbonite is broken atm also. Errors galore with no update up so meh on that suggestion. Good addon usually though. Warehouse function has always been broken and never reports correct numbers, shows old toons/deleted toons.